Other Assets and Liabilities - Summary of Components of Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, Other Assets and Other Liabilities Disclosure [Abstract]
Accrued dividends payable	$ 105,956	$ 104,271
Accrued interest payable	57,680	29,851
Accrued management and incentive fees payable	25,911	28,373
Current expected credit loss reserve for unfunded loan commitments	9,275	6,263
Accounts payable and other liabilities	7,272	9,046
Secured debt repayments pending servicer remittance	2,302	47,664
Derivative liabilities	979	5,890
Total	$ 209,375	$ 231,358